Because retinoid cascades are involved in the regulation and development of the central nervous system, including dopaminergic neurons, retinoic acid signaling defects may contribute to schizophrenia and substances dependence. Retinoid X receptors (RXRs) form heterodimer complexes with nuclear-related receptor 1 (NURR1) or with peroxisome proliferator-activated receptors (PPARs). We examined 48 Japanese patients with schizophrenia and 32 patients with alcohol dependence to detect mutations in the retinoid X receptor beta gene (RXRB) on chromosome 6p21.3, the NURR1 gene (NR4A2) on chromosome 2q22-q23, and the PPAR alpha gene (PPARA) on chromosome 22q12.2-13.1. A Val95Ala polymorphism of the RXRB gene, a Val227Ala polymorphism in the PPARA gene, and two synonymous single-nucleotide and CA repeat polymorphisms in the 5' region and 3' untranslated region of the NR4A2 gene were identified. Extended case control samples did not suggest an association between the diseases and the RXRB or PPARA polymorphisms. However, they revealed a significant association between the NR4A2 gene haplotype and alcohol dependence, indicating that 2q22-q23 including the NR4A2 gene locus is a possible genomic region contributing to genetic susceptibility to alcohol dependence.
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